/*
 * Copyright (c) 2011 Imre Fazekas.
 *  All rights reserved.
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *  Neither the name of the Brillien nor the names of its
 *  terms and concepts may be used to endorse or promote products derived from this
 *  software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.brillien.core.component.servlet;

import com.vii.brillien.core.component.sso.SubjectPresence;
import com.vii.brillien.core.management.BrillienServices;
import com.vii.brillien.ignition.BrillienContext;
import com.vii.brillien.ignition.transport.BrillienMediator;
import com.vii.brillien.ignition.transport.LoaderComplyer;
import com.vii.brillien.kernel.BrillienException;
import com.vii.brillien.kernel.axiom.sso.Session;
import com.vii.streamline.CommServlet;
import com.vii.streamline.apikey.ApiKeyValidator;
import com.vii.streamline.services.error.StreamLineException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public abstract class BrillienServlet extends CommServlet {

    protected SubjectPresence       ssoPresence;
    protected BrillienMediator      mediator;

    @Override
    protected boolean checkApiKeyRequired(){
        boolean apiKeyRequired = super.checkApiKeyRequired();

        return  BrillienServices.liaison != null
                ? BrillienServices.liaison.getApiKeyPresenceName() != null
                : apiKeyRequired;
    }

    @Override
    protected boolean checkSsoRequired(){
        boolean ssoRequired = super.checkSsoRequired();

        return  BrillienServices.liaison != null
                ? BrillienServices.liaison.getSSOPresenceName() != null
                : ssoRequired;
    }

    @Override
    protected ApiKeyValidator getApiKeyValidator() throws ServletException {
        try {
            return (ApiKeyValidator)BrillienServices.getPresenceByName( BrillienServices.liaison, BrillienServices.liaison.getApiKeyPresenceName() );
        } catch (BrillienException e) {
            throw new ServletException( e );
        }
    }

    protected SubjectPresence getSSOPresence() throws ServletException {
        try {
            return BrillienServices.<SubjectPresence>getPresenceByName(BrillienServices.liaison, BrillienServices.liaison.getSSOPresenceName());
        } catch (BrillienException e) {
            throw new ServletException( e );
        }
    }

    protected void setupMediatorContext( ServletConfig servletConfig ){

    }

    protected BrillienMediator getMediator() throws ServletException {
        if( mediator == null ){
            String username = getServletConfig().getInitParameter("username");
            String password = getServletConfig().getInitParameter("password");
            if( username == null ){
                username = "dispatcher" + this.getClass().getSimpleName(); password = "dispatcher";
            }
            try {
                if( mediator == null ){
                    setupMediatorContext( getServletConfig() );
                    mediator = BrillienContext.newMediator(username, password, new LoaderComplyer() {
                        @Override
                        public ClassLoader getLoader(String reference) {
                            try {
                                return BrillienServices.getPresenceManagerByName(
                                        BrillienServices.liaison, reference).getClassLoader();
                            } catch (BrillienException e) {
                                e.printStackTrace();
                                return this.getClass().getClassLoader();
                            }
                        }
                    });
                    mediator.connect();
                }
            } catch (BrillienException e) {
                throw new ServletException( e.getMessage(), e );
            }
        }
        return mediator;
    }

    @Override
    public void init() throws ServletException {
        super.init();

        if( ssoRequired )
            ssoPresence = getSSOPresence();

        getMediator();
    }

    @Override
    protected boolean checkCallPreconditions(HttpServletRequest req, HttpServletResponse resp){
        if( super.checkCallPreconditions(req,resp) ){
            try {
                if( ssoRequired && (req.getParameter("sessionId") == null || !ssoPresence.isAuthenticated( new Session( req.getParameter("sessionId") )) ) )
                    throw new StreamLineException( StreamLineException.ERROR_INVALID_CREDENTIALS, "Valid session is required!");
                return true;
            } catch (BrillienException e){
                sendError( req, resp, e.getErrorCode(), e.getMessage(), e.getValue() );
            } catch (StreamLineException e){
                sendError( req, resp, e.getErrorCode(), e.getMessage(), e.getPayLoad() );
            }
        }
        return false;
    }


}
